Safety device for staying machines



Aug. 31, 1926. 15%?,744

l W. R. WATSON ET Ag.,

SAFETY DEVICE FOR STAYING MACHINES Original Filed Oct. 24. 1323 Patented Aug. 31, 1926.

4awr"ran P "ft". litt WILLIAM `RawnoN wArsoN, oreUrsnLnY, .AND `rosari-r Hansenet weon, er naanronn, ENGLAND.

SAFETY DEVICE FOR STAYING MACHINES.

Application filed October 2li, 1923, Serial No. G70/35, and in Great Britain @ctober a6, 1.8.9.2. Renewed April l, 1926.

This invention relates to improvements connected with what are known as corner staying7 machines used in box-making.

7With this class of machine there is considerable risk of the operative getting the hand or fingers damaged `between the anvil and the knives or like while placing the box corners or staying material for same in position, guards and stop motions `have been provided to minimize the risk.

lt is our obj ect to arrange, construct and combine with the stayer machine and more particularly the"anvil portion thereof means and apparatus as hereinafter described which will Acause a stoppage of the `machine when undue pressure is put upon the anvil7 during the operating stroke of the knife or presser.

This arrangement will obviate the use of complicated guards which restrict output and there will `be no danger to the operative.

In the accompanying drawings wherein like or similar reference `letters indicate like or corresponding parts Fig. l is a sectional end view taken approximately on the line 1l of Fig. 2;

Fig. 2 is a plan on line 2 2 of Fig. 1, and

Fig. 3 is a detail of the upper stop motion referred to.

In the preferred form shown of our invention we construct the anvil holder H (or adapt an existing one) with the usual recess for holding the anvil but instead of allowing the anvil base to bed inA the said recess, we make the recess deeper and cut a number of slots or recesses A in the base, and in each recess mount on shaft C a cam or roller like member C which projects above the face of the bed and therefore tends to raise the anvil B. Where the anvil B is in two parts, a base plate B between same and the cam C will be employed.

These cam devices will be interconnected such as by being carriedv on the shaft C which shaft will be given a tendency to turn so as to raise the cam faces and exert an upward pressure kon the anvils B. This we accomplish by carrying from the shaft C a lever such as C2 passing through a suitable slot formed in the anvil holder and this lever will be spring pressed by means of an arm D suitably carried from a box or frame D. This arm. is in the nature of a shaft carried by arms D2 from a pivot .shaft D3 in the box D', a light spring pressure being placed on the shaft D3 so as to tend to keep the arm D in the down position.

`One of the end arms lD2 will actas a fender or stop for vthe rounded end F of a spring rod F also mounted for axial movementin the box. The other arm `D2 will be curved or cut away so as not to obstruct the rod F. A spring F2 in the box D tends to urge the rod F outwards, but with the end arm D2 yin its normal position this movement is prevented, but if an undue pressure is put upon the anvil then same will press downv the cams C, 'raise the lever C2 and arm D and allow the spring F2 to operate, when the rod F may move or slide in the direction of arrow l, Fig. 2.

The other end of the rod F is pivotally connected to the lower bifurcated end Gtg of a lever G, which lever is pivoted as at Gr (Fig. l) to a stand or arm G2 carried by the base Gf* suitably attached to the machine frame. This lever G atits upper end connects to a shaft J towards the upper part of the machine and this shaft may oscillate and slide, the oscillation being obtained by means of a roller K on a lever K attached toV shaft J making contact with a cam face of a cam L on the main or upper shaft M. The usual clutch mechanism common to this class of machine is employed but we slightly enlarge the clutch ring N which is between the cam L and boss P of the operating wheel as in Fig. 3 and on a portion of the periphery of rino' N we provide teeth N. The cam L and teeth N are so arranged that only when the presser is descending will the stop motion come into operation, therefore it is not necessary to provide teeth all the way round the periphery of the clutch ring.

On the shaft J is a lever or arm O having its end O adapted to enter the teeth N at any part of the downward travel of the presser. Tf we assume the apparatus is set and the parts as shown in Fig. l, and the presser is descending, if an operator puts his or her finger between the presser and the anvil, the anvil will yield, lift the lever C2 and arm D and release the rod F which will move along and operate the lever G and slide the shaft J in the direction of arrow 2 Fig. 3, and in slidinlg the shaft the same will turn, due to said shaft J carrying fi i) a pin J operating in a slot J 2 of a stationary bearing carried by the machine. This causes the arm O to move and its end O engage the teeth N in the clutch ring, thereby throwing out the clutch and stopping the motion.

The normal pressure of the presser on the anvil will depress the anvil, but at this portion of the stroke, which is comparatively small, the teeth N have either passed the catch O, or the cam L is so positioned that the roller K prevents the shaft J from turning. Assuming that the ordinary presser head has one inch, to travel up or down, this being the danger zone, in this case the teeth N will be arranged in the plate N for a distance equivalent to a travel of only E@ of an inch, or the cam L constructed to keep out the lever and catch O' O. After this travel there is no danger as a finger could not get in between the anvil Vand pressers with only 1/8 of an inch open, and for this portion of the traverse of the presser the tripping gear is not in operation.

To re-set the apparatus itl is necessary to press or pull the lever G to disengage the lever O from the teeth and to bring the rod F back within the box and the fender or arm D will fall back into contact with the lever C2 and depress same. If itis desired to give a longer or shorter anvil the mechanism above described in no way interferes with suoli adjustment as the lever C2 will ride under the arm D. I

lVe have found in practice that the above described apparatus is eilicient and the danger of trapping of operatives hands or lingers is practically eliminated coupled with the fact that the mechanism in no way decreasesthe output of the machine. While we have shown and described a suitable stop motion we may vary the construction of same so long as the movement of the rod F dueto pressure on the cams C causes same to be operated.Y y

W'hat we claim is: y

l. A safety device of the class described, comprising, in combination, a vertically reciprocable anvil and means for actuating a presser adapted to cooperate therewith, a longitudinally movable member disposed in parallelism with said anvil, tension means for automatically moving said member in one direction, means for normally holding said member against longitudinal movement, means operated by the anvil during its descending motion for releasing said holding means, and means actuated by said longitudinally movable member for stopping said presser actuating means.

2. A safety device of the class described, comprising, in combination, a vertically reciprocable anvil and means for actuating a presser adapted to cooperate therewith,a longitudinally movable member disposed in parallelism with said anvil, tension means for automatically moving' said member in one direction, means for normally holding said member against longitudinal movement, means operated by the anvil during its descending motion for releasing said holding means, a pivoted lever connected to said longitudinally movable member and adapted to be swung on its pivot upon release of said member, and means operated by said lever for stopping said presser actuating means. 3. A safety device of the class described, comprising, in combination, a vertically reciprocable anvil and means fory actuating a presser adapted to cooperate therewith, a longitudinally movable member disposed in parallelism with said anvil, tension means for automatically moving said member in one direction, a spring-pressed pivoted frame adapted normally to hold said member against movement, means operated by the anvil during its descending motion to swing said frame on its pivot thereby to release the longitudinally movable member, and means operated by said member for stopping the operation of said presser actuating means.

4f. 3A safety device of the class described, comprising, in combination, a vertically reciprocable anvil and means for actuating a presses adapted to cooperate therewith, an axially movable shaft disposed in parallelism with said presser actuating means, means for rocking said shaft during its aXial movement, retaining means carried by said shaftffor preventing operation of the presser operating means, and means operated by the anvil during its downward rmtion for actuating the shaft thereby to carry its retaining means into operative position relative to said presser actuating means.

In testimony whereof we have signed our names to this specification.

VILLIAM RAW'DON VATSON. JOSEPH HERBERT WOOD. 

